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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a58ed4444ad872c9f16ac10cf5b0857a57d27de4cba6adbb7b1b9443d84c5495' 
  AND token = 'rMs8v3xDGXj2fKtSxv7QDbkHPew1vjfjz9ER8/BfG9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}